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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

A 1.00−MT bomb exploded a few kilometers above the ground deposits 25.0% of its energy into radiant heat.

(a) Find the calories per cm2 at a distance of 10.0 km by assuming a uniform distribution over a spherical surface at that radius.

(b) If this heat falls on a person’s body, what temperature increase does it cause in the affected tissue, assuming it is absorbed in a layer 1.00−cm deep?

To determine

(a)

The radiant heat at a distance of 10.0 km in cal per cm2 due an explosion of a 1.00 MT bomb.

Explanation

Given:

Energy of the bomb

  E=1MT

Percentage of energy converted into radiant heat

  E0=25% of E

Distance at which the radiant energy is measured.

  r=10.0 km

Calculation:

Express the energy of the bomb in cal.

  E=1 MT×9.993× 10 14cal1 MT=9.993×1014cal

Calculate the energy converted into radiant heat.

  E0=25% of E=25100×9.993×1014cal=2

To determine

(b)

The change in the temperature of the human body if this radiation is absorbed by 1 cm thick tissue.

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